The New York Times
If Mr. Spencer's name were not openly attached to Breed, it would still read like the work of a serious writer with keen antennas for sensory detail. But this is a gruesome book, a full-bore foray into the horror genre, so literary loveliness goes only so far. It is probably best avoided by anyone not wishing to know exactly what it's like to eat a baby pigeon. Above and beyond its fatality count Breed has originality on its side; the ending is a true shocker. The book sets out to convey what it is like to be "subject to the whip and rattle of unspeakable temptations." And it does.
—Janet Maslin